Fix typo (comments)

Assets/VRM/UniJSON/Scripts/ListTreeNode/ListTreeNode.cs

@@ -247,7 +247,7 @@ namespace UniJSON
 
                 foreach (var kv in r)
                 {
-                    // Addded
+                    // Added
                     yield return JsonDiff.Create(kv.Value, JsonDiffType.KeyAdded, kv.Value.Value.ToString());
                 }
             }

Assets/VRM/UniJSON/Scripts/Utf8String/Utf8StringExtensions.cs

@@ -73,7 +73,7 @@ namespace UniJSON
                                 break;
 
                             default:
-                                // unkonw escape
+                                // unknown escape
                                 throw new ParserException("unknown escape: " + p.Second);
                         }
                     }